Solid Electrolyte Battery Analysis Cell with Integrated SoC Adjustment

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Solution Overview

Problem

Existing methods for analyzing lithium secondary batteries, such as 3-electrode cells, face structural distortion and contamination issues due to reference electrode insertion, making it difficult to accurately measure electrochemical signals and replicate the internal structure of actual products.

Innovation Solution

A system and method that incorporates a housing with a solid electrolyte matrix, a reference electrode, and a State of Charge (SoC) adjustment member, allowing for the implementation of symmetric, 2-electrode, and 3-electrode cells within the same cell, minimizing errors and facilitating comprehensive resistance analysis.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a reference electrode is inserted in a 3-electrode cell for resistance analysis, then electrochemical signals can be measured, but structural distortion occurs and contamination of the reference electrode affects measurement accuracy

Engineering Contradiction:

Improveelectrochemical signal measurementVSAvoidstructural stability and contamination resistance

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent extracts the reference electrode from the cell structure after measurement is completed. The cell is designed to allow easy removal of the reference electrode, preventing long-term structural distortion and contamination while still enabling electrochemical signal measurement during the analysis process

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent performs preliminary adjustment of State of Charge (SoC) in two-unit cells through charge/discharge cycles before separating the unit cells to create the symmetric cell. This preliminary action ensures proper electrochemical conditions are established before the actual resistance analysis, improving measurement precision while avoiding structural issues

Inventive Principle:

Principle #10Preliminary action

2Ease of manufacture

If symmetric cells are manufactured by adjusting SoC in two-unit cells through charge/discharge and then separating them, then resistance analysis can be performed, but electrodes may be damaged and electrolytes may be contaminated

Engineering Contradiction:

Improvesymmetric cell fabricationVSAvoidelectrode integrity and electrolyte purity

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent merges multiple cell types (symmetric cell, 2-electrode cell, and 3-electrode cell) into a single integrated cell structure. This allows the cell to function as different electrode configurations as needed, eliminating the need for separate cell fabrication processes and reducing the risk of electrode damage and electrolyte contamination associated with manual separation

Inventive Principle:

Principle #5Merging (Combining)

3Adaptability or versatility

If multiple cell types (symmetric, 2-electrode, 3-electrode) are implemented separately, then specific analysis functions can be performed, but device complexity and manufacturing difficulty increase

Engineering Contradiction:

Improveanalysis function capabilityVSAvoidcell structure variety and manufacturing process

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent creates a universal cell structure that can function as a symmetric cell, 2-electrode cell, or 3-electrode cell depending on the configuration of electrodes and reference electrodes. This multi-functional design allows a single cell to perform all required analysis functions, significantly reducing device complexity and manufacturing difficulty while maintaining full adaptability for different analysis types

Inventive Principle:

Principle #6Universality (Multi-functionality)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution enables precise analysis by reducing cathode/anode overlap resistance, signal distortion, and electrode damage, allowing for simultaneous symmetric and 3-electrode testing, and determining SoC/SoH of cathodes and anodes, while accommodating various electrolyte types and electrode designs.

Implementation Method 1

a matrix including a solid electrolyte having lithium ion conductivity

Methodology Applied

Scientific EffectIon conductivity: Conduction (electrical)

Data Source

PatentUS20230307727A1Analysis system for lithium secondary battery and analysis method using same

Publication Date: 2023.09.28 HYUNDAI MOTOR CO LTD

AI summary

A system for analyzing a solid-state battery and a lithium rechargeable battery such as a lithium ion battery, and an analysis method using the system are proposed. The analysis system for a lithium secondary battery includes a housing having an accommodation space therein, and a lithium secondary battery accommodated in the accommodation space of the housing and being chargeable and dischargeable, in which the lithium secondary battery includes: an electrolyte part. The system also includes a first electrode part positioned on a side of the electrolyte part, and a second electrode part positioned on another side of the electrolyte part, in which the electrolyte part includes a matrix including a solid electrolyte having conductivity for lithium ions, one or more reference electrodes inserted in the matrix, and one or more SoC adjusters inserted in the matrix at a predetermined distance in a width direction from the reference electrode.